whAt is thE mAin iDEA oF this pAssAgE
A．oBEsity is now A gloBAl proBlEm thAt nEEDs tACkling.
B．thE wEights inCrEAsE FAst throughout thE wholE worlD.
C．oBEsity AnD stArvAtion ArE two mAin proBlEms in thE poor worlD.
D．oBEsity hAs shiFtED Front thE riCh worlD to thE poor worlD.